Publication date: 15th December 2025
The structural symmetry of materials significantly impacts their physical properties and enables new applications. Beyond the optoelectronic applications, the large spin-orbit coupling in highly tunable two-dimensional (2D) hybrid halide perovskites can lead to Rashba and/or Dresselhaus spin splitting, which, when combined with other multifunctional properties, make them promising for spin-orbitronic applications. 2D halide perovskite materials could be rationally designed by structural tuning to achieve the desired noncentrosymmetry. Here we utilize the complex interplay between the organic spacer cations (especially asymmetric halogenated spacer cations), the A-site cations, metal cations (Pb, Sn, Bi and Ag), halide anions, and dimensionality to design non-centrosymmetric 2D metal halide perovskites that exhibit second harmonic generation (SHG), ferroelectricity, Rashba splitting and persistent spin textures. These rational design strategies to unlock and control non-centrosymmetry in diverse metal halide perovskites and their nanostructures introduce nonlinear optical properties, ferroelectric properties, and exotic spin textures for spin-orbitronic and quantum applications.
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